Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15318980741287…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 15:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4193fb990bfcf58714223186e48fcca5 SHA-1: c4ef6c5466968cdd94d7e064f166ddddb7f21cb9 SHA-256: dd15318980741287825bb7a803072d667e314c91e39ddd9da1f33b6cb2e209c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ostrichtours.com/ckfinder/userfiles/files/32839541064.pdf In PDF document text
    • http://hitplus.eu/userfiles/file/74426101963.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/92878127235.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0bbabf81b5aa923d73ac3155759811a0/sasotevalos.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/45178634070.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fasomipebokelikolewadik.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/43960382328.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/21136846487.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/mivirazopovarer.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/bebufajipot.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/zevuvexopulesibosuxu.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/6691365808.pdfIn PDF document text
    • http://hbaoge.com/upload/files/63797789485.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/vofosilerataxeroxekabelek.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/zapezupa.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902233756881375.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/38429193734.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130e32a298af---nufitotanavefebefururasir.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/5485214981.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/sumimofafimevilipabifarej.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/kagizufukorisodudaxut.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/74087398624.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/91911441065.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210905161253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=caryl+churchill+a+number+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 10884 bytes
SHA-256: 5a04554593f0d2ad86e03f57c2abae0649e240a8659e2f64a857a4e1d4895531
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 17808 bytes
SHA-256: 70590c4c7630a0ab27ff8966b907c220340ffe9b217f8cc11f8b0f8a40e7e199

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